Converter RS-232/RS-422. The PV140 is a phone line converter kit from Pelco providing a bi-directional electrical interface connecting an RS-422 and RS-232 data port. The PV140 converter kit comes with a 12 VDC power supply, 1.2 watts, an RS-232/422 converter, and is suitable for using with RS-422/RS-485 ports which are located on the Pelco brand of multiplexers, camera control receivers, keyboards, and switchers.